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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Description of key information

Not relevant, decomposition before melting under standard pressure from 262 °C on

Key value for chemical safety assessment

Additional information

Testing for this endpoint has been waived in accordance with Annex XI, 2, restrictions as testing is technically not feasible.

Frost et al. (2006) used thermogravimetry under ambient pressure combined with mass spectrometry to study the thermal decomposition of a synthetic hydronium jarosite. Changes in the molecular structure were followed by infrared emission spectroscopy. Mass spectrometry through evolved gases confirmed the mass loss steps, which were observed at 262, 294, 385, 557 and 619 °C.

It can thus firmly concluded from these observations that the submission item decomposes from 262 °C on before melting under standard pressure and melting is thus not a relevant process for the chemical safety assessment of the submission item.

  • Frost RL, Wills RA, Kloprogge JT, Martens WN (2006). Thermal decomposition of hydronium jarosite (H3O)Fe3 (SO4)2 (OH)6. DOI 10.1007/s10973-005-6908-0 Print ISSN 1388-6150 Online ISSN 1572-8943 Journal of Thermal Analysis and Calorimetry 83(1):213-8. URL